Ovo-vegetarian diets are somewhat less popular than vegan diets, which exclude all animal-derived foods and byproducts completely, as well as lacto-ovo-vegetarian diets, which include dairy products and eggs but not meat, poultry, or fish.

Well-planned vegetarian diets of any kind tend to be nutritious and very healthy. Still, there are several reasons why someone may choose an ovo-vegetarian diet over other types.

Whole eggs are both affordable and nutritious, making them a great addition to almost any diet. They serve as an excellent source of high-quality protein, B vitamins, and anti-inflammatory compounds (1).

In fact, some people choose to include eggs in an otherwise animal-free diet if they have difficulty meeting their nutrient needs on a strictly vegan diet.

An ovo-vegetarian diet would also be an appropriate choice for someone who wants to be a vegetarian but has allergies or sensitivities to dairy products.

Furthermore, others may choose the diet because of religious, environmental, or ethical concerns about the treatment of animals used to produce meat and dairy.

Those who are motivated by these ethical issues often make sure to only eat humanely sourced eggs and egg products.

Summary Ovo-vegetarian diets exclude all animal products except for eggs. People may choose this dietary pattern for health, environmental, religious, or ethical reasons.

An ovo-vegetarian diet may benefit your health in various ways.

May contribute to improved diet quality

Research suggests that people who follow vegetarian diets typically eat more nutrient-dense foods, such as fruits, vegetables, legumes, and whole grains, compared to non-vegetarians (2).

Many experts think that this may be the reason why vegetarians typically have better health outcomes than non-vegetarians, but more research is needed before a clear cause-and-effect relationship can be established (3).

Good for your heart

If you’re looking to make dietary changes that benefit your heart, an ovo-vegetarian diet could be effective.

Multiple studies observe that vegetarians may have a 30–40% reduced risk of heart disease, compared to non-vegetarians (4).

What’s more, when paired with regular exercise and stress management practices, vegetarian diets have been shown to lower blood pressure and cholesterol levels, as well as reverse the accumulation of plaque within blood vessels (4).

Promotes balanced blood sugar

A recent review of 14 studies found that vegetarians are approximately 25% less likely to develop type 2 diabetes, compared to non-vegetarians (5).

Additionally, people who already have the condition may experience improved insulin sensitivity and better blood sugar control on a vegetarian diet (5).

The typically higher intake of whole grains, fruits, and vegetables of those on vegetarian diets seems to play a significant role in diabetes prevention.

More specifically, foods like dark leafy greens and root vegetables that are high in fiber, beta-carotene, vitamin C, and magnesium may have the strongest preventive effects (5).

Other benefits

Vegetarian diets are associated with several other health and lifestyle benefits, including:

Weight loss. Vegetarian diets are often lower in calories and may promote weight loss more effectively than omnivorous diets (2, 6).

Support gut health. Vegetarian diets are rich in fiber and health-promoting plant compounds that can increase the growth of healthy gut bacteria, which leads to better digestive function and improved immunity (7, 8).

May reduce cancer risk. Some studies indicate that vegetarian diets may reduce cancer risk by up to 12%, though more research is needed (9).

More affordable. High-quality meat and dairy products can be rather expensive. Thus, vegetarian diets may be more affordable.

Though vegetarian diets have many positive attributes, it’s important to remember that no specific result is guaranteed.

Summary An ovo-vegetarian diet may offer many health benefits, including a reduced risk of heart disease, diabetes, and cancer. It may also improve gut health and promote a healthy weight.

For most people, an ovo-vegetarian diet is very safe and healthy. However, you may fall short of obtaining certain essential nutrients if you don’t plan your diet well.

Vitamins, minerals, and omega-3s

Meat, fish, and dairy products are often a major source of these nutrients in non-vegetarian diets. Therefore, removing them may lead to deficiencies if you’re not careful to replace them with vegetarian alternatives.

Here are a few foods that can provide these nutrients as you transition to an ovo-vegetarian diet:

Vitamin D. Spending time in the sun is the best way to encourage vitamin D production in your skin. Eggs from pasture-raised chickens, fortified foods, and mushrooms treated with UV light are also good sources (13, 14, 15).

Vitamin B12. Eggs are a good source of vitamin B12. The same holds true for fortified foods like milk substitutes or nutritional yeast (16).

Zinc. Whole grains, eggs, nuts, seeds, and legumes are all good sources of zinc that are ovo-vegetarian friendly (17).

If you find that you’re unable to meet your needs for any of these nutrients through diet alone, consult your healthcare provider or a dietitian about taking supplements.

Vegetarian junk foods

Not all ovo-vegetarian-friendly foods are healthy.

Dairy-free pastries, fried foods, processed vegetarian meat substitutes, as well as sugar-sweetened beverages, cereals, and candies, technically fit an ovo-vegetarian lifestyle but should be consumed sparingly, if at all.

Summary Vegetarian diets may be low in certain nutrients, potentially putting you at risk of deficiencies. Focus on planning a nutritionally complete diet that can meet your needs with plant-based sources of these nutrients.

Though certain foods are restricted on an ovo-vegetarian diet, you have plenty of nutrient-dense options from which to choose.

A well-planned ovo-vegetarian diet is ideally comprised of a variety of whole, plant-based foods, such as:

Keep in mind that just because a food is vegetarian doesn’t mean it’s healthy. To reap the health benefits of an ovo-vegetarian diet, it’s important to focus on whole, minimally processed foods as much as possible.

Summary Various foods, such as legumes, grains, vegetables, nuts, seeds, eggs, and fruits, make up a healthy ovo-vegetarian diet. Practice moderation if you’re including ultra-processed foods.

The main foods to avoid on an ovo-vegetarian diet are meats and dairy products, but certain meat-based food additives should be excluded as well.

If you’re transitioning to an ovo-vegetarian diet, avoid the following:

You may find vegetarian alternatives for many of these foods. Still, keep in mind that these substitutes may not always be nutritionally equivalent.

For example, most dairy-free milk alternatives don’t provide the same amounts of protein and minerals as regular cow’s milk. This doesn’t make them a bad option per se, but it’s worth considering if your goal is to build a nutritionally complete vegetarian diet.